@import"https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@300;400;500;600;700&display=swap";:root{--bg-deep: #05070a;--bg-card: rgba(13, 17, 23, .7);--accent-primary: #3b82f6;--accent-secondary: #8b5cf6;--text-main: #f8fafc;--text-muted: #94a3b8;--glass-border: rgba(255, 255, 255, .1);--glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, .37);--success: #10b981;--error: #ef4444;--font-body: "Inter", sans-serif;--font-display: "Outfit", sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-deep);color:var(--text-main);font-family:var(--font-body);line-height:1.6;overflow-x:hidden;background:radial-gradient(circle at 50% 50%,#0f172a,#020617);min-height:100vh}.app-container{display:flex;min-height:100vh}.sidebar{width:320px;background:var(--bg-card);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-right:1px solid var(--glass-border);padding:2rem 1.5rem;height:100vh;position:sticky;top:0;overflow-y:auto;z-index:100}.sidebar h1{font-family:var(--font-display);font-size:1.5rem;font-weight:700;margin-bottom:2rem;background:linear-gradient(135deg,var(--accent-primary),var(--accent-secondary));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;display:flex;align-items:center;gap:.5rem}.nav-list{list-style:none}.nav-item{margin-bottom:.5rem}.nav-link{display:flex;align-items:center;padding:.8rem 1rem;border-radius:12px;color:var(--text-muted);text-decoration:none;transition:all .3s ease;cursor:pointer;border:1px solid transparent}.nav-link:hover{background:#ffffff0d;color:var(--text-main)}.nav-link.active{background:#3b82f61a;color:var(--accent-primary);border-color:#3b82f633}.main-content{flex:1;padding:2rem 4rem;max-width:1000px;margin:0 auto}.card{background:var(--bg-card);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--glass-border);border-radius:24px;padding:3rem;box-shadow:var(--glass-shadow);margin-bottom:2rem}.prose h1{font-family:var(--font-display);font-size:2.5rem;margin-bottom:1.5rem}.prose h2{font-family:var(--font-display);font-size:1.8rem;margin-top:2rem;margin-bottom:1rem;color:var(--accent-primary)}.prose h3{font-size:1.3rem;margin-top:1.5rem;margin-bottom:.8rem;color:var(--accent-secondary)}.prose p{margin-bottom:1.2rem;color:#cbd5e1}.prose ul,.prose ol{margin-bottom:1.2rem;margin-left:1.5rem}.prose li{margin-bottom:.5rem}.prose strong{color:#fff}.tabs{display:flex;gap:1rem;margin-bottom:2rem;background:#ffffff08;padding:.5rem;border-radius:16px;width:fit-content}.tab-btn{padding:.6rem 1.5rem;border-radius:12px;border:none;background:transparent;color:var(--text-muted);cursor:pointer;font-weight:500;transition:all .3s ease}.tab-btn.active{background:var(--accent-primary);color:#fff;box-shadow:0 4px 12px #3b82f64d}.quiz-container{display:flex;flex-direction:column;gap:2rem}.question-card{animation:fadeIn .5s ease-out}.option-btn{width:100%;padding:1.2rem 1.5rem;margin-bottom:1rem;border-radius:16px;border:1px solid var(--glass-border);background:#ffffff08;color:var(--text-main);text-align:left;cursor:pointer;transition:all .2s ease;font-size:1rem}.option-btn:hover{background:#ffffff14;border-color:var(--accent-primary);transform:translate(4px)}.option-btn.selected{background:#3b82f633;border-color:var(--accent-primary)}.option-btn.correct{background:#10b98133;border-color:var(--success)}.option-btn.incorrect{background:#ef444433;border-color:var(--error)}.btn-primary{background:linear-gradient(135deg,var(--accent-primary),var(--accent-secondary));color:#fff;border:none;padding:1rem 2.5rem;border-radius:14px;font-weight:600;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 15px #3b82f64d}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 20px #3b82f666}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@media(max-width:900px){.app-container{flex-direction:column}.sidebar{width:100%;height:auto;position:static}.main-content,.card{padding:1.5rem}}.chat-fab{position:fixed;bottom:2rem;right:2rem;width:64px;height:64px;border-radius:50%;border:none;background:linear-gradient(135deg,#3b82f6,#8b5cf6);color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:0 8px 32px #3b82f666;z-index:1000;transition:transform .2s ease}.chat-fab:hover{transform:scale(1.1)}.chat-window{position:fixed;bottom:2rem;right:2rem;width:420px;height:600px;max-height:80vh;background:#0d1117f2;backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border:1px solid rgba(255,255,255,.1);border-radius:24px;display:flex;flex-direction:column;overflow:hidden;z-index:1000;box-shadow:0 25px 60px #00000080}.chat-header{display:flex;align-items:center;justify-content:space-between;padding:1rem 1.25rem;background:#ffffff08;border-bottom:1px solid rgba(255,255,255,.08)}.chat-close{background:transparent;border:none;color:#94a3b8;cursor:pointer;padding:6px;border-radius:8px;transition:all .2s}.chat-close:hover{background:#ffffff14;color:#fff}.chat-messages{flex:1;overflow-y:auto;padding:1rem;display:flex;flex-direction:column;gap:1rem}.chat-msg{display:flex;gap:10px;max-width:90%}.chat-msg.user{align-self:flex-end;flex-direction:row-reverse}.chat-msg-icon{width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0;background:#ffffff14;color:#94a3b8}.chat-msg.assistant .chat-msg-icon{background:#3b82f626;color:#3b82f6}.chat-msg-content{padding:.75rem 1rem;border-radius:16px;font-size:.9rem;line-height:1.5;position:relative}.chat-msg.assistant .chat-msg-content{background:#ffffff0f;color:#e2e8f0;border-bottom-left-radius:4px}.chat-msg.user .chat-msg-content{background:linear-gradient(135deg,#3b82f6,#6366f1);color:#fff;border-bottom-right-radius:4px}.chat-msg-content p{margin:0}.chat-tts-btn{position:absolute;bottom:-8px;right:-8px;width:28px;height:28px;border-radius:50%;border:1px solid rgba(255,255,255,.1);background:#0d1117e6;color:#8b5cf6;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .2s}.chat-tts-btn:hover{background:#8b5cf633;transform:scale(1.15)}.chat-tts-btn:disabled{opacity:.4;cursor:not-allowed}.chat-msg-content.typing{display:flex;gap:4px;align-items:center;padding:1rem}.chat-msg-content.typing span{width:8px;height:8px;border-radius:50%;background:#3b82f6;animation:typingDot 1.4s infinite}.chat-msg-content.typing span:nth-child(2){animation-delay:.2s}.chat-msg-content.typing span:nth-child(3){animation-delay:.4s}@keyframes typingDot{0%,60%,to{opacity:.3;transform:scale(.8)}30%{opacity:1;transform:scale(1)}}.spin{animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.chat-input-area{display:flex;gap:8px;padding:1rem;border-top:1px solid rgba(255,255,255,.08);background:#ffffff05}.chat-input{flex:1;padding:.75rem 1rem;border-radius:14px;border:1px solid rgba(255,255,255,.1);background:#ffffff0d;color:#fff;font-size:.9rem;outline:none;transition:border-color .2s}.chat-input:focus{border-color:#3b82f6}.chat-input::placeholder{color:#64748b}.chat-send{width:44px;height:44px;border-radius:14px;border:none;background:linear-gradient(135deg,#3b82f6,#8b5cf6);color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .2s}.chat-send:hover{transform:scale(1.05);box-shadow:0 4px 12px #3b82f64d}.chat-send:disabled{opacity:.4;cursor:not-allowed;transform:none}@media(max-width:500px){.chat-window{width:calc(100vw - 2rem);height:calc(100vh - 6rem);bottom:1rem;right:1rem}}